[PATCH] [UBsan] Dumping call stacks when reporting bad-cast (-fsanitize=vptr)

[Alexey Samsonov]

================
Comment at: lib/ubsan/ubsan_handlers_cxx.cc:38
@@ +37,3 @@
+  //        the syncronization in InitializeSanitizerCommon().
+  InitializeSanitizerCommon();
+
----------------
Required early initialization of UBSan is a separate problem. Let's deal with it later, in subsequent patches.

http://reviews.llvm.org/D4410